Not much to say there. Valid solution is a keygen that produces a valid key for any given name.
Binaries for Linux and Windows are provided. Plain C, no symbols stripped, compiled with -O0, so should be fairly easy to follow.
Difficulty is medium. Or perhaps easy for someone with some math knowledge. Here are some valid keys:
Name: hekliet
Key: 3fec806bc9ce82d4c00ee01af273a0b5
Name: Tuts 4 You
Key: 40105e5bb69056bd3fdc1a4496fa9430
Name: Guybrush Threepwood
Key: 400e09a63ee6d3a2bfd94d31f7369d10
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